Antireflection coatings are generally applied to the surface of lenses to reduce light loss by minimising the reflection of one or more wavelengths. By adding an additional substance for light to interact with, a straightforward coating can be created to reduce reflection at a material interface. By having light reflect from two interfaces that each have a smaller difference in Anti-Reflective Coatings Market indices than the initial interface, this can lower the system's overall reflection coefficient. The geometric mean of the two materials that originally made up the interface yields the coating's refractive index (nc), which is the ideal value to reduce the total reflection coefficient.
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